The extension could not be loaded because it was not properly signed

Hi EveryOne!,

I'm newbibe to this group and I'm starting to develop an extension for Photoshop CC 2015.

After I configuring everything right and run sample extension from Eclipse, it still returns "extension could not be loaded because it was not properly signed."

when I try to open it. This happens to every other development testing extensions. What should I do in order to not bump into this error?

Also I changed the My manifest.xml and debug mode 1 etc... but same result happen. Please suggest/advice.

-yajiv

Samples: